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quant-ph2013★ 8 cited
From Classical Mechanics with Doubled Degrees of Freedom to Quantum Field Theory for Nonconservative System
Y. Kuwahara, Y. Nakamura, Y. Yamanaka
The -matrix structure of Green's functions is a common feature for the real-time formalisms of quantum field theory under thermal situations, such as the closed time pa…
quant-ph2012★ 11 cited
From superoperator formalism to nonequilibrium Thermo Field Dynamics
Yusuke Nakamura, Yoshiya Yamanaka
Emphasizing that the specification of the representation space or the quasiparticle picture is essential in nonequilibrium quantum field system, we have constructed the unique unpe…